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Standard nuclear magnetic resonance spectrum of polyacrylonitrile
There seems to be no such standard at present. You can find your standard number and keywords in Gongbiao.com, where there are a lot of standards. It is said that there are hundreds of thousands of standards. It is also convenient to find standards in Gongbiao.com. It is said that the intelligent search engine is used, and the relevant standards can be easily found by entering the standard number!

Go to the homepage of Baidu's "Work Standards Network" and find your own standard number or keyword, and you can find the relevant standards!